[PATCH] strncpy -Wstringop-truncation in bfd/

Alan Modra amodra@gmail.com
Thu Feb 22 10:43:00 GMT 2018


On Wed, Feb 21, 2018 at 12:44:06PM -0800, John Reiser wrote:
> Several uses of strncpy in bfd/* do not compile when using -Werror in gcc 8.0.x
> because of -Wstringop-truncation.  A typical warning is:
> 
>    ../../binutils-gdb/libiberty/dyn-string.c:280:3: warning: ‘strncpy’ output truncated before terminating nul copying as many bytes from a string as its length [-Wstringop-truncation]
> 
> A work-around is to use 'memcpy' instead of 'strncpy'.  This spends
> a few more cycles each time; but it compiles, and runs correctly
> as long as the character arrays really are strings.  Patch is attached.

But memcpy doesn't write zeros past the string terminator.  If we're
writing to a file we want zeros rather than rubbish.

-- 
Alan Modra
Australia Development Lab, IBM



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